Gas engine



H. D. MURRAY Feb 10, 1931.

GAS ENGINE Filed Dec. 2 Sheets-$hee1 l INVENTOR. J

A TTORNEYS.

H. D. MURRAY Feb. 10, 1931.

GAS ENGINE ile 192 2 SheetLs-Shee 2 A TTORNEYS.

ered in a separate charge, the gas ceiver. A bypass Patented Feb. 10, 1931 UNITED STATES PATENT OFFICE.

HARRY D. MURRAY, OF GROVE .CITY, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO COOPER-BESSEMER CORPORATION, OF MOUNT VERNON, OHIO, A CORPO- RATION OF OHIO Application filed December 3, 1927. Serial No. 237,421.

This invention is designed to improve gas engines. Two cycle engines have been made in which the air for combustion is delivered to the engine and gas for combustion delivpressure being suflicient for the injection. Engines have also been made in which the gas and,

air are drawn into a compressor and delivered as mixture to the engine. The separate injection of gas to the engine is more economical than where the air and gas are delivered together as a mixture and it is, therefore, desirable to provide engines for normal running with such delivery of fuel. But itis often desirable in the starting of the engine, and under certain conditions, to provide means whereby the engine may have its gas and air delivered together as a mixture. This mode of delivery does not involve an initial pressure of the gas. .The present invention provides means whereby the engine may be operated on either plan at the will of the operator. Features and details of the invention will appear from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings as follows Fig. 1 shows a side elevation of the engine.

Fig. 2 is a central section through a part of the cylinder.

Fig. 3 a sectional view of the cylinder showing the inlet valve.

Fig. 4: a side elevation of the inlet valve actuating mechanism.

Fig. 5 a sectional View of the control valve.

1 marks the engine bed, 2 the engine cylinder, 3 the crank shaft, 4 the piston, 40 the piston rod which operates on shown) in the usual manner. Gas is supplied through a pipe 5. It delivers through a branch 5a to a compressor 6, the compressor being driven from a crank 7 on the crank shaft. A pipe to a receiver 9.

' 11 extends from the pipe regulating valve 12 is arranged in the pipe 11 and Weighted to close on' a predetermined pressure. It will be noted that any excess of pressure in the re- 10 to a pipe 13. A

bymeans of a pin 30 on the arm 28.

'latch has a locking the crank (not 8 leads from the compressor A pipe 10 leads from the receiver 9 incident to the action of the compressor 6.is immediately bypassed by way of the pipe 11 and regulating valve 12 back to the supply pipe 5 so that it is again run through the compressor. In this way a definite pressure may be maintained in the receiver 9.-

A governor valve 15 is arranged in the pipe 10. Any ordinary governor may be used. As shown it is an ordinary throttle governor driven from a belt 16 extending to the crank shaft, or other driven part of the engine. A pipe 17 leads from the governor valve to an inlet valve chamber 18. An inlet port 19' leads from the chamber 18 and is controlled by an inlet valve 20. The inlet valve '20 has a stem 21. A spring- 22 yieldingly holds the inlet valve in closed position.

A shoulder 23 1s arranged on the stem of the 24. The forked arm 24 is fixed on a rock shaft 24a journaled in a ing from the cylinder head. A rock arm 26 is actuated by a rod 27, this rod being actuated by a cam, or eccentric (not shown) on the engine shaft. The rock arm is journaled on the rock shaft 24a. It has extending from it an arm 28. Alatch 29 is pivotally mounted The gages a finger 32. The finger 32 is fixed on the shaft 21. 1. andconsequentlyactuates as it rocks the arm 24. The latch 29 has an arm 33 which rides a cam 34, this cam being arranged to trip the latch at any desired point. A spring 35 holds the latch in engagement.

Air is delivered to the engine through an air inlet valve 36 which delivers air to a chamber 37. This port 38 with the front end of the cylinder, the piston operating in connection with the front end of the cylinder forming an air pump. The piston rod 4a extends through a gland 10 and thus forms a pump shoulder. The chamber 37 is connected by a port 41 with an air inlet port 42 which is controlled by .the piston in the ordinary manner of a twocycle engine and controlled by the piston.

bracket 25 extendshoulder 31 which enchamber is connected by a A gas pipe 39 leads to a gas port 39a, which port is closed and opened by the elements of the air valve, the air valve as shown being of the ordinary plate variety. Thus the air valve when gas is delivered through the pipe 39 operates as a mixing valve and the chamber 37 as a mixing chamber.

A three-way valve 44 is arranged at the junction of the pipes 10 and 13. The plug of this valve is provided with ways 45, 46 and 47 A threeway val e 48 is arranged at the junction of the pipe 17 and 39. The plug of this valve is provided with the ways 49, 50 and 51. lVith the parts as shown in the drawings, gas is being delivered by way of the ports 45, 47 directly through the pipe 10 and through the ports 4951 directly through the pipe 17 so that gas is delivered through the inlet valve 20 and is cut off from the mixing valve. The valves 44 and 48 are provided with operating handles 44a and 48a respectively. When it is desired to operate the engine with the gas delivered through the mixing valve and consequently with a suction ef fort on the gas line the valve 44 is thrown so that the port 47 leads from the pipe 13 and the port 46 is in register with the upper end of the pipe 10 and the lower part of the pipe 10 is cut ofi. Thus gas is received direct from the supply pipe 5 by way of the pipe 13. At the same time, the valve 48 is thrown, bringing the port 49 into register with the pipe 39 and the port 50 into register with the incoming side of the pipe 17 Thus gas is permitted to flow from the initial end of the pipe 17 to the pipe 39 but is cutofl' from the inlet valve 20. It will be seen, therefore, that the engine may be operated either for the direct injection of the gas, or the gas may be drawn in with the air and delivered as a mixture at the will of the operator.

What I claim as new is 1. In a gas engine, the combination of a cylinder; a piston in the cylinder; an air de livery means comprising a compressor; a gas supply means; and means controlling the delivery of gas either directly to the cylinder with the gas supply under pressure, or to the air deli ery means at the will of the operator.

2. In a gas engine, the combination of a cylinder; a piston in the cylinder; an air delivery means comprising a compressor; a gas supply conduit leading to the cylinder; 8. gas supply conduit leading to the air delivery means; and a valve mechanism controlling said conduits.

3 Ina gas engine, the combination of a cylinder; :1 piston in the cylinder; an air delivery means comprising a compressor; a gas supply means a gas pump; a connection leading from the gas pump directly to the cylinoer; a connection leading from the gas supply means to the air delivery means; and valve mechanisms controlling said connections.

in hand.

y HARRY D. MURRAY. 

